Learn more about R-1640 Metric Series Bearings with the part specifications here to decide if it is the ideal ball bearing for your application. NMB is the world's leading manufacturer of high quality miniature and instrument ball bearings, including R-1640. When you are ready to purchase R-1640, follow the links provided to the inventory currently available through our bearing distributors, or learn more about similar Metric Series Bearings in inventory. Find the precision bearings you need with NMB Technologies Corporation.